Wizard charming a monster in battle when cursed with "Lose your class"

[killshot111]

Sorry if this question was asked already but I couldn't find anything with my search criteria/search terms.

What's the timing of this play. If I remember correctly (I don't have the cards in front of me), my friend was a wizard fighting a monster in battle. He had items usable only by wizards but with these bonuses, he was able to beat the monster.

Someone played a Lose your Class card (or whatever it was) to make them go from Wizard to whatever was in the discard pile (turned into a Thief). Now, he can no longer use the items usable only by wizards and was losing the fight. He asked if he could as a response to the curse, quickly charm the monster. I said I wasn't sure.

Is he able to charm the monster or he lost the class due to the curse and wouldn't be able to charm? Thanks for your reply.